Suggest using a conventional-traditional 3 way pan-tilt head sized as needed. These can be found with ease as there were a LOT of them made from a host of brands. A light weight 4x5 field camera is likely to be less than 5 pounds full up with lens and all. This is not that much more than a DSLR or medium format camera with a larger lens. There is a tripod-camera support system requirement for rigidity and stability (heavier and all that IS better, but), but it is just not that great with a lightweight field camera.
It might be ideal to try the 4x5 on a reasonable ball head then decide if a better ball head is the way. Essentially, take a test drive before deciding on the final choice of tripod head.
Tripods and tripod heads tend to get travel-user abuse and getting something pretty-precious will be reduced to a foto utility item in short time. Keeping this simple could be the the better trade off.
Bernice
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